Die casting machine



DIE CASTING MACHINE Filed July 7, 195? 2 Sheets-Sheet 1 we a r Dec.'12,1939. VONTQBEL 2,183,112

DIE CASTING MACHINE Filed July 7, 1937 2 Sheets-Sheet 2 IV va v 5% PPatented Dec. 1 2, 1939 I 9 DIE CASTING MACHINE akob Vontobel,Teufenthal, Switzerland, assignor to the firm InjectaAktiengesellschaft, Teufenthal, Canton of Aargan, Switzerland, a

, joint-stock company of Switzerland Application July 7, 1937, SerialNo. 152,406 In Germany August 7, 1936 '3 Claims. (01. 22-68) v Thepresent invent-ion relates to die casting maestal and carrying boltedthereto one half 4 of chines for manufacturing dense castings from themould and further comprises a movable plate alloys having a high meltingpoint. 6 slidably held on four rods secured to said With such metals thehitherto known methods standard. The other half 1 of the mould is fastof die casting cannot be easily employed. The to plate 5. The mould, achill, has, besides the 5 use of such metals in a liquid state proved tobe mould l0 and the holes l9 for the pilot pins, also wasteful onaccount of the corroding and wearguides 8 for the cores 9 and an inletconduit II ining away of the moulds. Therefore machines t nd d as astorage an pressure chamber. This were proposed having a cold chamberinto which inlet conduit includes also an intermediate cham- 10 themetal was introduced by hand in a pasty state. ber or enlarg 3 S paratedfrom the inlet 10 But then with this half liquid metal also slag and themould by two restricted passage ways 33 would be filled in. Moreover,the metal would 501- and 35, the latter branching oif Sidew y and idifyat the gate, for the gate is necessarily highly forming the direct inletof the mould. The inlet constricted to facilitate breaking'the wastefrom orifice I2 is conically e ed. The mould and 5 the casting. Thisfact and the tenacity of the the inlet passages are provided with holesl3 for metal had a bad influence on the forming of the the ejector pins.surfaces and the texture of the castings. The movable mould P ate 6 isconnected by castings were characterized by porosity and even meansStays With a Pusher pl te "5 and belarge' holes and cavities. tweenthese two plates are slidably arranged, on It has already been proposedfor die castings o e d e Core P t H and 011 the Other d 9 made of lowmelting alloys to act with several the ejector p a e 8- e pe ati f thepusher pressures of different amount upon the metal p at '6 n e y e pe nand closing of while solidifying in the mould in order to imthe mould iseffected by means 'of a knee joint prove the texture of the same.Difierentpresmovement 22. sures were employed for the introducing andaf- A median red 20 Carries d bly mounted terwards for the compressing.But for high thereon a cross bar 2| to which are linked two meltingalloys this method wont do, because it links 22 which-are linked withtheir free ends to is hardly possible to conceive control apparatus thejoints of two joi ted pairs f t0ggle arms 4 which can exactly follow thesolidifying process linked to the pusher Plate l6 and t the station-Within the mould. ary guide block 23. If the crossbar is moved' With themethod according to the present intoward the right from the positionshown, the two vention the effect of two successive different prestogglepairs of arms 24 Will bend d pen the sures is obtained with only asingle source of mould- If t e Cross bar moves ma Contrary ipressure bya contrivance by which, although the rection the mould will be closed,as shown in the metal is employed in a very liquid state, resistdrawing.The mould c s be Opened a d 35 ances to flow are used which retard thefilling closed by other e s n e o e echaof the form up to the beginningof the pressure of nism here illustrated. The guide block 23 is thepiston, with the purpose to carry the pressure bolted to the bedplate l.on the liquid metal by the piston only to a pres- The pressure cylinder25 with the piston 26 is sure adapted to overcome the static pressure ofcarried by the pedestal 2. The pressure cylinder 40 the metal fillingthe mould. Thus after having may be displaced in two directions by meansof filled the mould softly and with an even speed the the slides 3|, 32and the screw spindles 29 (Fig. high pressure of the piston becomes thenefiective 2), 30 (Fig. 3). Thus the piston 26 may be adand compressesthe metal in the mould by utilizjusted to be co-axial with the inletpipe or presing part of the metal in the inlet. sure chamber II in thecase of difierently sized 45 The annexed drawings representsschematically moulds. The piston is withdrawn so far from as an examplea casting machine for a T pipe the inlet conduit duringthe introducingof the fitting. metal, that the metal may be easily poured in Fig. 1 isa vertical section of the mould and by means of a ladle or otherwise.Figs. 2 and 3 are side and end elevation on a The machineis operated asfollows: 50 smaller scale of a casting machine. When the machine is atrest the mould is open According to the drawings the mould box is atandthe piston 26 withdrawn from the inlet ll tached toapedestal 2 mountedupon a bedplate l. The cores 9 are inserted into the movable half Themould box is. in two parts and comprises a of the chill. In thiscondition the mould will be stationary plate 3 cast in one piece withthe pedclosed by operating the piston rod 20 and a so- 55 ciated togglemechanism, whereupon the metal in a very liquid state is filled into theinlet conduit II by means of a ladle. Immediately after this the piston26-will be introduced into the inlet conduit and the still liquid metal,which has been checked from the immediate admission into themould by therestricted passage ways 33, and the intermediate chamber 34, will bepressed into the mould by a pressure of the piston which pressure willbe maintained unto the complete solidifying of the metal. During thisoperation all air will escape through the vents 28 while impurities slagand the like, are retained by the restricted passage ways of the inlet.

When the metal has been completely solidified the mould is opened andthe casting expelled by the ejector pins. In this way a rapid deliveryof castings may be obtained. In consideration, that the mechanism forthe timed moving of piston 26, pusher plate I6, core plate I! andejector plate 18 and core screws 21 may be supposed to be well known andmay be arranged in different ways, such mechanism has not been shown indetail.

What I claim as new is:

1. Apparatus for single shot die-casting of manually ladled hightemperature alloys in liquid condition, said apparatus comprising a diehaving a mold cavity, a generally upright pressure chamber communicating,with a conventional highly constricted gate formed at the mold cavity,the communication between the pressure chamber and the gate includingalternate constrictions and enlargements suitably dimensioned to retardthe initial flow of metal from the pressure chamber to the gate, therebeing two constrictions with an abrupt and substantial enlargementtherebetween, all in addition to the aforesaid constricted gate, aplunger, means to reciprocate the same into and out of the pressurechamber, said plunger being fully retractable from the pressure chamberin order to facilitate manual ladling of a quantity of the liquid metalinto the pressure chamber, and means to eject the solidifled residuefrom the pressure chamber, the enlargement, and the die cavity, saidpressure chamber being higher than the gate, whereby the metal whenfirst ladled therein would, if unobstructed, quickly flow to the gate,the arrange- 11192121 acting to retard the initial flow of the me 2.Apparatus for single 'shot die-casting of manually l'adled hightemperature alloys in liquid condition, said apparatus comprising a diehaving a mold cavity, a generally uprightpressure' chamber communicatingat its lower end with a conventional highly constricted gate formed atthe bottom of the mold cavity, whereby the metal being cast flowsdownwardly, sidewardly, and then upwardly into the mold cavity, thecommunication between the pressure chamber and the gate includingalternate constrictions and enlargements suitably dimensioned to retardthe initial flow of metal from the pressure chamber to the gate, therebeing two constrictions and two enlargements, all in addition to theaforesaid constricted gate, a plunger, means to reciprocate the sameinto and out of the pressure chamber, said plunger being fullyretractable from the pressure chamber in order to facilitate manualladling of a quantity of the liquid metal into the pressure chamber, andmeans to eject the solidifled residue from the pressure chamber, theenlargements, and the die cavity, said pressure chamber being higherthan the gate, whereby the metal when first ladled therein would, ifunobstructed, quickly flow to the gate.

3. Apparatus for single shot die-casting of manually ladled hightemperature alloys in liquid condition, said apparatus comprising a diehaving a mold cavity at the parting face, a generally upright pressurechamber also formed in the die at the parting face and communicating atits lower end with a conventional highly constricted gate formed at thebottom of the mold cavity, whereby the metal being cast flowsdownwardly, sidewardly, and then upwardly into the mold cavity, thecommunication between the pressure chamber and the gate includingalternate constriations and enlargements formed in the die at theparting face and suitably dimensioned to retard the initial flow ofmetal from the pressure chamber to the gate, there being twoconstrictions and two enlargements all in addition to the aforesaidconstricted gate, a plunger,- means to reciprocate the same into and outof the pressure chamber, said plunger being fully retractable from thepressure chamber in order to facilitate manualladling of a quantity ofthe liquid metal into the pressure chamber, and means to eject thesolidified residue from the pressure chamber, the enlargements, andthedie cavity, said pressure chamber being higher than the gate, thearrangement being devoid of mechanical valves or the like to obstructthe flow of metal.

, JAKOB VONTOBEL.

